Dembski-Bowden is rapidly becoming my favorite WH40K author, with his easy, flowing style and ability to solidify a great story with strong, identifiable characters. This was my first exposure to the Grey Knights, a secret Legion of Adeptus Astartes that has dedicated their lives to rooting out the Neverborn (Chaos) and basically exterminating it. The added element of psyker abilities and the fact that their existence must be kept secret from humans made this a great surprise. Told from the first person view of Hyperion, a young Grey Knight who is part of the Castian group, this story combines the Grey Knights under the instruction of the Inquisition, the battle of Armageddon with the Neverborn, and to make the story really interesting, the Space Wolves Astartes trying to protect humans from extermination by the Inquisition because of their knowledge of the Grey Knights and the forces of Chaos. I was very impressed how the author pulled all this together into a tightly woven tale, full of tension, intrigue, and a lot of emotion as well.